Your life is up for sale. Dozens of websites are collecting as much personal information as possible and offering up their databases for a price.

Nicki Dillinger, from WTVG, said, "Anybody can go and just decide to look you up and find your current address and go knock on your door if they really wanted to."

Your address is just one puzzle piece the sites can reveal. We showed Fresno Police Detective Doug Reese what the site MyLife.com had on him.

Reese said you have probably given this information to various organizations online by signing up for social media, registering for sweepstakes, or just ordering services like cable or internet. It's perfectly legal and the sites can have some positive purposes.

Vanessa Waite with Spokeo said, "All of the success stories really fall into two categories-- helping to connect and helping to protect."

Spokeo gave us a video of a father and son reunited because of their service and they take credit for reunions all over the country. They said Spokeo can also help protect people from catfishing scams on dating sites or identify scammers making phone calls. But Reese said it is probably best to erase as much of your information as possible."It's out there. You want to be concerned. You want to be proactive about it. Try not to be overly paranoid about it."